BREAKING: Error out if to or from options is passed in config

Author: RyanZim

index.js

@@ -214,7 +214,12 @@ function rc (ctx, path) {
   if (argv.use) return Promise.resolve()
 
   return postcssrc(ctx, path)
-    .then((rc) => { config = rc })
+    .then((rc) => {
+      if (rc.options.from || rc.options.to) {
+        error('Config Error: Can not set from or to options in config file, use CLI arguments instead')
+      }
+      config = rc
+    })
     .catch((err) => {
       if (err.message.indexOf('No PostCSS Config found') === -1) throw err
     })

test/config.js

@@ -45,3 +45,33 @@ test("doesn't error on empty config", async function (t) {
     await read('test/fixtures/a.css')
   )
 })
+
+test('errors if `to` is set', async function (t) {
+  const env = `module.exports = {
+    to: 'out.css'
+  }`
+
+  const dir = await ENV(env, ['a.css'])
+
+  const { stderr } = await cli(
+    ['a.css', '-o', 'output.css', '--no-map'],
+    dir
+  )
+
+  t.regex(stderr, /Config Error: Can not set from or to options in config file, use CLI arguments instead/)
+})
+
+test('errors if `from` is set', async function (t) {
+  const env = `module.exports = {
+    from: 'in.css'
+  }`
+
+  const dir = await ENV(env, ['a.css'])
+
+  const { stderr } = await cli(
+    ['a.css', '-o', 'output.css', '--no-map'],
+    dir
+  )
+
+  t.regex(stderr, /Config Error: Can not set from or to options in config file, use CLI arguments instead/)
+})